nginx 自建证书https 报错 no "ssl_certificate" is defined in server listening on SSL port while SSL handshaking

自建证书:
 openssl genrsa -des3 -out ssl.key 
mv ssl.key ssl_bak.key 
openssl rsa -in ssl_bak.key -out ssl.key
openssl req -new -key ssl.key -out ssl.csr
openssl x509 -req -days 365 -in ssl.csr -signkey ssl.key -out ssl.crt

查看错误日志：
tail -f error.log
no "ssl_certificate" is defined in server listening on SSL port while SSL handshaking

解决办法：

vim xxx.conf
listen 443 default;